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Date: Tue, 17 Jan 2006 12:20:38 +1100
From: Dion Gillard <dion.gillard@gmail.com>
To: Maven Users List <users@maven.apache.org>
Subject: Re: [m1.1-b-2] how can I initialize a variable/prop just once and
 share with subprojects in multiproject build?
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Yep, that works well. Since you want it to be available to all
projects, the system properties are one way to do it.

On 1/17/06, Max Cooper <max@maxcooper.com> wrote:
> Well, I am not sure this is a good answer, but I found something that
> works -- save it in the systemScope:
>
> <preGoal name=3D"build:start">
>   <j:set var=3D"svnRevision" value=3D"${systemScope.getProperty('my.svnRe=
vision')}"/>
>   <j:if test=3D"${svnRevision =3D=3D null}">
>     <ant:echo>Getting revision...</ant:echo>
>     <!-- code to get svn revision omitted -->
>     <j:set var=3D"svnRevision" value=3D"XXXXXX"/>
>     <!-- save in system scope -->
>     ${systemScope.setProperty('my.svnRevision', svnRevision)}
>   </j:if>
> </preGoal>
>
> Comments are still welcome. :-)
>
> -Max
>
> On Mon, 2006-01-16 at 15:14 -0800, Max Cooper wrote:
> > I want to initialize a variable or property just once at the beginning
> > of a multiproject build and then be able to access that value in any of
> > the subprojects. Ideally, running a subproject build on it's own would
> > also initialize the value.
> >
> > For instance, so far I have something like this in my shared,
> > common/maven.xml file:
> >
> > <preGoal name=3D"build:start">
> >   <j:if test=3D"${svnRevision =3D=3D null}">
> >     <ant:echo>Getting revision...</ant:echo>
> >     <!-- code to get svn revision omitted, but I can post it if anyone
> > is interested -->
> >     <j:set var=3D"svnRevision" value=3D"XXXXXX"/>
> >   </j:if>
> > </preGoal>
> >
> > This doesn't work -- "Getting revision..." is echoed for each subprojec=
t
> > build, which means that svnRevision isn't set in the context of each of
> > the individual builds. I don't actually think this code should work (it
> > makes sense that each subproject *would* have it's own independent
> > instance of the svnRevision variable) -- I am just looking for tips
> > about what I might change to get it to work. I just don't know where I
> > can "stash" the value so that it will be available in the subproject
> > builds.
> >
> > Thanks,
> > -Max
> >
> >
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>


--
http://www.multitask.com.au/people/dion/
"In order to succeed, your desire for success should be greater than
your fear of failure." - Bill Cosby

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